const fs = require('fs');
const path = require('path');
const appDirectory = fs.realpathSync(process.cwd());
const resolveApp = relativePath => path.resolve(appDirectory, relativePath);
const getPublicUrlOrPath = require('react-dev-utils/getPublicUrlOrPath');
const publicUrlOrPath = getPublicUrlOrPath(
    process.env.NODE_ENV === 'development',
    require(resolveApp('package.json')).homepage,
    process.env.PUBLIC_URL
);
const ignoredFiles = require('react-dev-utils/ignoredFiles');
// WS
const host = process.env.HOST || '0.0.0.0';
const sockHost = process.env.WDS_SOCKET_HOST;
const sockPath = process.env.WDS_SOCKET_PATH; // default: '/sockjs-node'
const sockPort = process.env.WDS_SOCKET_PORT;

function resolvePath(dir) {
    return path.join(__dirname, dir);
}
module.exports = function (proxy, allowedHost) {
    return {
        // WebpackDevServer 2.4.3 introduced a security fix that prevents remote
        // websites from potentially accessing local content through DNS rebinding:
        // https://github.com/webpack/webpack-dev-server/issues/887
        // https://medium.com/webpack/webpack-dev-server-middleware-security-issues-1489d950874a
        // However, it made several existing use cases such as development in cloud
        // environment or subdomains in development significantly more complicated:
        // https://github.com/facebook/create-react-app/issues/2271
        // https://github.com/facebook/create-react-app/issues/2233
        // While we're investigating better solutions, for now we will take a
        // compromise. Since our WDS configuration only serves files in the `public`
        // folder we won't consider accessing them a vulnerability. However, if you
        // use the `proxy` feature, it gets more dangerous because it can expose
        // remote code execution vulnerabilities in backends like Django and Rails.
        // So we will disable the host check normally, but enable it if you have
        // specified the `proxy` setting. Finally, we let you override it if you
        // really know what you're doing with a special environment variable.
        disableHostCheck: !proxy || process.env.DANGEROUSLY_DISABLE_HOST_CHECK === 'true',
        // hot-reloading
        hot: true,
        // publicPath: path.join(__dirname, outputPath),
        filename: 'static/js/[name].[hash:8].js',
        // Enable gzip compression of generated files.
        compress: true,
        // Silence WebpackDevServer's own logs since they're generally not useful.
        // It will still show compile warnings and errors with this setting.
        clientLogLevel: 'none',
        port: 9000,
        // Our build script will copy `public` into the `build` folder.
        // In `index.html`, you can get URL of `public` folder with %PUBLIC_URL%:
        // <link rel="icon" href="%PUBLIC_URL%/favicon.ico">
        // In JavaScript code, you can access it with `process.env.PUBLIC_URL`.
        // Note that we only recommend to use `public` folder as an escape hatch
        // for files like `favicon.ico`, `manifest.json`, and libraries that are
        // for some reason broken when imported through webpack. If you just want to
        // use an image, put it in `src` and `import` it from JavaScript instead.
        contentBase: resolvePath('public'),
        contentBasePublicPath: publicUrlOrPath,
        // It is important to tell WebpackDevServer to use the same "publicPath" path as
        // we specified in the webpack config. When homepage is '.', default to serving
        // from the root.
        // remove last slash so user can land on `/test` instead of `/test/`
        publicPath: publicUrlOrPath.slice(0, -1),
        public: allowedHost,
        // `proxy` is run between `before` and `after` `webpack-dev-server` hooks
        proxy,
        // By default files from `contentBase` will not trigger a page reload.
        watchContentBase: true,
        // Use 'ws' instead of 'sockjs-node' on server since we're using native
        // websockets in `webpackHotDevClient`.
        transportMode: 'ws',
        // Prevent a WS client from getting injected as we're already including
        // `webpackHotDevClient`.
        injectClient: false,
        // Enable custom sockjs pathname for websocket connection to hot reloading server.
        // Enable custom sockjs hostname, pathname and port for websocket connection
        // to hot reloading server.
        sockHost,
        sockPath,
        sockPort,
        // It is important to tell WebpackDevServer to use the same "publicPath" path as
        // we specified in the webpack config. When homepage is '.', default to serving
        // from the root.
        // remove last slash so user can land on `/test` instead of `/test/`
        publicPath: publicUrlOrPath.slice(0, -1),
        // WebpackDevServer is noisy by default so we emit custom message instead
        // by listening to the compiler events with `compiler.hooks[...].tap` calls above.
        quiet: true,
        // Reportedly, this avoids CPU overload on some systems.
        // https://github.com/facebook/create-react-app/issues/293
        // src/node_modules is not ignored to support absolute imports
        // https://github.com/facebook/create-react-app/issues/1065
        watchOptions: {
            ignored: ignoredFiles(resolveApp('src')),
        }
    }
}